[NTG-context] [***SPAM***] Question about current ConTeXt with XeTeX

I just read in contextgarden.net the following: "Note that XeTeX uses mkii and LuaTeX uses mkiv ; in principle mkii is frozen so new features and improvements will only happen in mkiv." I use the ConTeXt which comes in TEXLIVE 2012, which I assume uses Mark IV. Does that mean that I can not use this version of ConTeXt with XeteX which also comes packaged in TEXLIVE? Regards